package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @BelongsProject: hm-dianping
 * @BelongsPackage: com.hmdp.utils
 * @Author: 成希
 * @CreateTime: 2025-05-21  14:11
 * @Description: TODO
 * @Version: 1.0
 */

public class LoginInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
    public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate=stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //1.获取请求头中的token
        String token = request.getHeader("Authorization");
        if (!StrUtil.isNotBlank(token)) {
            response.setStatus(401);
            return false;
        }
        //2.基于token获取redis中的用户
        String key=RedisConstants.LOGIN_USER_KEY+token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            //4.不存在 拦截
            response.setStatus(401);
            return false;

        }
        //5.将查询到的Hash 数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.存在 保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期  放行
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }
}
